Electric time-switch.



On A. BRUUN. ELECTRIC} TIME SWITCH. APPLICATION FILED mums, 1907.

927,486. Patented July 13, 1909.

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- UNITED sT T s orro AUGUST "B-RUUN, )or corn PATENro FroE,

NHAGEN', DENMARK, assroNon T NIELS BENDDKEN, OF

COPENHAGEN, DENMARK,

l sr lmrnrc 'rnm-swicrcn;

No.1927g4se.

1 mark, whose postal address is 41 Vimmelskaftet, Copenhagen, Denmark, have invented an mproved Electric Time-Switch,

of which the following a s ecification.

Thepresent invention mates to electric long distance switches which closea circuit by a push button being pressed, and allow this circuit to remain closed for acertain, period, three minutes forinstance.

The invention consists in an especiallysimple construction whereby partly the switch becomes very cheap to manufacture, and partly its action veryreliable. This is attained mainly by using, instead ofthe complicated clock works. ordinarily employed, in the known long distance, time switches;to regulate the length of time during which the circuit is to remain closed, an air bag or-bellows which'isj extended b the pressure .on a push button and which etermines the enod of closure by the time it requires for eing again contracted;

On the accompanying drawing is shown,-

by way of example, anoutline diagram of one manner of execution of the automaton.

Referring to the drawing, 1 re 4 resents the lamps in'the stair case, 2 the pus buttons in the different stories. The wiring diagram is of the usual design, the'current passing from the [one pole of the generator- 3, throu h a common wire 4 tothe one terminal of al the lamps and the push buttons while, b means of a conductor 5, the other termina s of the said push buttons are connected to the other ole of the batte or the like, there belng inserted in the sai conductor a-magnetizing coil or solenoid 6 and a switch 7 When a button is pressed a circuit 1s closed causing the coil 6 to attract its iron core 8. The latter terminates at the bottom in a valve cone.

resting ona correspondingvalve seat 9 in the cover10 of the bellows or bag'11. vThrough the lower end of the iron core passes a pin 13 striking, whenlifted somewhat, .a stop 12 fastened on the cover 10, so that the armature 8, on its further passage upward, extends the'bellows, the air entering, at the same time through the valve 9; Y

To the to end ,of the armature is fastened a bar 1 of rass' or other non-magnetic material, a d-this bar has at its top a striking head hitting when thesarmature -8 is lifted,

Specification of lLetters Patent. Application as much 26, 1907.. Serial No. 364,651,

Patented ma 13, i909;

I a pin 15 on the lever 7 of the switch, by

which means thesw-itch is shifted from its normal position to the other one, where a. pawl 16 catches it and keeps it. As ring; 17 counteracts the levers motion. alienthe ,lever7 tips over, it breaks the connectionfrom the generators onepole throu h. the lever 7 and the contact spring, 18 to t 'e-'- coil 6, so that vthe latter .is deprived of -cur--' ed by means of another contact spring '19- wherebythelam circuit'is closed, so-that the lamps are li ted. When the solenoid 6 is thusdeprive of current, its core 8 drops down, until it rests on the valve seat 9' whereby the-valve is cl'osedand the bellows would then remain extended, if there were not provided in the cover a minute hole 20 through which theair escapes slowl' so that "the cover sinks very slowly. A OVGgtllfGjb hole 20 is a screw21, by means of which escape of air, and thereby the speed of. col-. lapse of the bellows, may be regulated.

To the top end of the bar 14 connected With the core or armature .8 is fastened a hook 22 reaching over an arm-23 extending from the pawl 16, so that the pawl is released at a certain point of its downward motion. When the awl is released, the. spring 17 'draws the ever 7 back into its 5' normal position, whereby the lamps are extinguishedJ The apparatus 'is now 1n 1ts original state, and may again be seti'nto ac- .tion by a new. pressure'on one of the push buttons ar out of action, as long as the lamps bur it is further readily'understoodthat the current through the solenoid or magnetizing coil 6 is never interrupted m 0&1'1188 current I only for a short while. These properties are of main importance for stair-case automatons, because the latter, if not ossessin these properties, are hardly ca abe'of;wor

si erable time.

Besides the valve 9, in the cover 10, there may be provide another valve24 whose valve is kept closed by its weight or by a spring, but when the cover, during ts down- ,ward assa'ge, has reached a cer'talnpo nty the va ve cones bar strikes thhbellows botrent, and at the same time contact is efi'ct- 65 buttons 2. It 1s evident that all the push Q the push buttons proper, and that the coil 7,

ing regularlyfor'any concone is extended downward by a bar. Y

When the cover is in its upper'po'sition, this tom, and during further-motion of the cover, 0 I

v the weight of the armature 8 etc.

the valve is thus opened, the air enters and the bellows collapse quickly on account of This arran ement has for its object to increase-the stro e against the arm 23 of the pawl 16, so that the pawl is certain to be released.

What I claim as my invention, and desire to secure by Letters Patent, is

1 The combination with an electric circuit of a time switch having a solenoid, means for closing said circuit when the solenoid is operated, and for demagnetizing the latter when the circuit is closed, a fluid retarding device for delaying the return movement of the solenoid core, and means for opening the circuit during such return movement.

2. The combination with an electric circuit of a time switch having a solenoid, means for closing said circuit when the solenoid is 0 erated, and for demagnetizing the latter w en the circuit is closed, a fluid retarding device for delaying the'return movement of the solenoid core, means for opening the circuit toward the end of such return movement,

and means for accelerating the movement of the solenoid core toward the end of its return movement, whereby the switch is operated to open the circuit with 'a short jerk.

3. The combination with an electric circuit of a time switch having a solenoid, means for, closing said circuit when the solenoid is 0 erated, and for demagnetizing the latter W en toward the end of such return movement, and a valve adapted toquickly release said fluid retarding device toward the end of the return movement of the solenoid core, where- .by the switch is operated with a short jerk.

4. The combination With an electric circuit of a time switch having a solenoid, means for closing said circuit when the solenoid is operated, and for demagnetizing the latter when the circuit is closed, means for opening the circuit during the return movement of the solenoid core, a fluid retarding device for delaying the return movement of the solenoid core, said device comprising a collapsible air chamber connected to the lower end of the solenoid core, and a valve in said collapsible air chamber adapted to ermit a quick flow of air therefrom toward tli movement of said core, whereby the latter is permitted to drop quickly to actuate said switch.

In witness whereof, I have hereunto signed my name in the presence of two subscribing witnesses.

OTTO AUGUST BRU UN;

Witnesses J LIUs LEHMANN, HERMAN e end of the return 

